1. Create Webcenter schemas for your custom Webcenter Portal with RCU utility
Custom portal will look for MDS, WEBCENTER and ACTIVITIES schemas. Best practice is to create them all specific for your custom portal.
2. Register your custom MDS schema through Fusion Middleware Control
3. Run WebCenter_ORACLE_HOME/common/bin/config.sh and extend your domain with template WebCenter_ORACLE_HOME/common/templates/applications/oracle.wc_custom_portal_template_11.1.1.jar
3.1 Extend the domain in "home domain setup folder", i.e. the aserver path
3.2. Configure your custom schema datasources.
3.3. Configure Managed Servers, Clusters and Deployment targets according to your HA setup.
4. Pack your domain into template from aserver path on installation machine.
5. Unpack template and propagate domain settings into mserver path on all domain machines.
If you are unsure how to do steps 3-5 look into Enterprise Deployment Guide, especially chapter 6 and adapt the procedure to Custom Webcenter managed server and your environment.
Document references:
Chapter 7 Deploying WebCenter Applications in Administrator's Guide for Oracle WebCenter, http://download.oracle.com/docs/cd/E21764_01/webcenter.1111/e12405/wcadm_deploy.htm#BABBAHHJ
and 3.1.8.2 Extending the Domain to Create Custom Managed Servers in Installation Guide for Oracle WebCenter, http://download.oracle.com/docs/cd/E21764_01/install.1111/e12001/config.htm#CBDEIJJI,
Chapter 6 Extending the Domain for WebCenter Components in Enterprise Deployment Guide for Oracle WebCenter, http://download.oracle.com/docs/cd/E21764_01/core.1111/e12037/extend_wc.htm#CACDEGGH
